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Phase 3 Letter of Intent (1/2)

Phase 3 Letter of Intent (1/2). Short: N Pages May Refer to MONARC Internal Notes to Document Progress Suggested Format: Similar to PEP Extension

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Phase 3 Letter of Intent (1/2)

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  1. Phase 3 Letter of Intent (1/2) • Short: N Pages • May Refer to MONARC Internal Notes to Document Progress • Suggested Format: Similar to PEP Extension • Introduction: deliverables are realistic technical options and the associated resource requirements for LHC Computing; to be presented to the experiments and CERN, in support of Computing Model development for the Computing TDRs. • Brief Status; Existing Notes • Motivations for a Common Project --> Justification (1) • Goals and Scope of the Extension --> Justification (2) • Schedule: Preliminary estimate is 12 Months from completion of Phase 2, that will occur with the submission of the final Phase 1+2 Report. Final report will contain a proposal for the Phase 3 milestones and detailed schedule • Phase 3A:Decision on which prototypes to build or exploit • MONARC/Experiments/Regional Centres Working Meeting • Phase 3B: Specification of resources and prototype configurations • Setup of simulation and prototype environment • Phase 3C: Operation of prototypes and of simulation; analysis of results • Phase 3D: Feedback; strategy optimization December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  2. Phase 3 Letter of Intent (2/2) • Equipment Needs (Scale specified further in Phase 3A) • MONARC Sun E450 server upgrade • TB RAID Array, GB memory upgrade • To act as a client to the System in CERN/IT, for distributed system studies • Access to Substantial system in the CERN/IT infrastructure consisting of a Linux farm, and a Sun-based data server over Gigabit Ethernet • Access to a Multi-Terabyte robotic tape store • Non-blocking access to WAN links to some of the main potential RC (e.g. 10 Mbps reserved to Japan; some tens of Mbps to US) • Temporary use of a large volume of tape media • Relationship to Other Projects and Groups • Work in collaboration with CERN/IT groups involved databases and large scale data and processing services • Our role is to seek common elements that may be used effectively in the experiments’ Computing Models • Computational Grid Projects in US; Cooperate in upcoming EU Grid proposals • US other National Funded efforts with R&D components • Submitted to Hans Hoffmann for Information on our Intention to Continue • Copy to Manuel Delfino December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  3. Phase 3 LoI Status • Monarc has met its milestones up until now • Progress Report • Talks in Marseilles: General + Simulation • Testbed Notes: 99/4, 99/6, Youhei’s Note --> MONARC number • Architecture group notes: 99/1-3 • Simulation: Appendix of Progress Report • Short papers (Titles) for CHEP 2000 by January 15 December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  4. MONARC Phase 3: Justification (1) • General: TIMELINESS and USEFUL IMPACT • Facilitate the efficient planning and design of mutually compatible site and network architectures, and services • Among the experiments, the CERN Centre and Regional Centres • Provide modelling consultancy and service to the experiments and Centres • Provide a core of advanced R&D activities, aimed at LHC computing system optimisation and production prototyping • Take advantage of work on distributed data-intensive computingfor HENP this year in other “next generation” projects [*] • For example in US: “Particle Physics Data Grid” (PPDG) of DoE/NGI;+ “Joint “GriPhyN” proposal on Computational Data Grids by ATLAS/CMS/LIGO/SDSS. Note EU Plans as well. • [*] See H. Newman, http://www.cern.ch/MONARC/progress_report/longc7.html December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  5. MONARC Phase 3 Justification (2A) More Realistic Computing Model Development (LHCb and Alice Notes) • Confrontation of Models with Realistic Prototypes; • At Every Stage: Assess Use Cases Based on Actual Simulation, Reconstruction and Physics Analyses; • Participate in the setup of the prototyopes • We will further validate and develop MONARC simulation system using the results of these use cases (positive feedback) • Continue to Review Key Inputs to the Model • CPU Times at Various Phases • Data Rate to Storage • Tape Storage: Speed and I/O • Employ MONARC simulation and testbeds to study CM variations, and suggest strategy improvements December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  6. MONARC Phase 3 Justification (2B) • Technology Studies • Data Model • Data structures • Reclustering, Restructuring; transport operations • Replication • Caching, migration (HMSM), etc. • Network • QoS Mechanisms: Identify Which are important • Distributed System Resource Management and Query Estimators • (Queue management and Load Balancing) • Development of MONARC Simulation Visualization Toolsfor interactive Computing Model analysis (forward reference) December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  7. MONARC Phase 3: Justification (3) • Meet Near Term Milestones for LHC Computing • For example CMS Data Handling Milestones: ORCA4: March 2000 ~1 Million event fully-simulated data sample(s) • Simulation of data access patterns, and mechanisms used to build and/or replicate compact object collections • Integration of database and mass storage use (including caching/migration strategy for limited disk space) • Other milestones will be detailed, and/or brought forward to meet the actual needs for HLT Studies and the TDRs for the Trigger, DAQ, Software and Computing and Physics • ATLAS Geant4 Studies • Event production and and analysis must be spread amongst regional centres, and candidates • Learn about RC configurations, operations, network bandwidth, by modeling real systems, and analyses actually with • Feedback information from real operations into simulations • Use progressively more realistic models to develop future strategies December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

  8. MONARC: Computing Model Constraints Drive Strategies • Latencies and Queuing Delays • Resource Allocations and/or Advance Reservations • Time to Swap In/Out Disk Space • Tape Handling Delays: Get a Drive, Find a Volume, Mount a Volume, Locate File, Read or Write • Interaction with local batch and device queues • Serial operations: tape/disk, cross-network, disk-diskand/or disk-tape after network transfer • Networks • Useable fraction of bandwidth (Congestion, Overheads): 30-60% (?)Fraction for event-data transfers: 15-30% ? • Nonlinear throughput degradation on loaded or poorly configurednetwork paths. • Inter-Facility Policies • Resources available to remote users • Access to some resources in quasi-real time December 10,1999: MONARC Plenary Meeting Harvey Newman (CIT)

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